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| 1. |
\frac { \operatorname { sec } \theta - \operatorname { tan } \theta } { \operatorname { sec } \theta + \operatorname { can } \theta } = 1 - 2 \operatorname { sec } \theta \operatorname { tan } \theta + 2 \operatorname { tan } ^ { 2 } \theta |
| Answer» | |